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 *     * Redistributions of source code must retain the above copyright
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 *       derived from this software without specific prior written permission.
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#include "protos_generator/gen_repeated_fields.h"

#include <string>
#include <vector>

#include "google/protobuf/descriptor.pb.h"
#include "google/protobuf/descriptor.h"
#include "protos_generator/gen_accessors.h"
#include "protos_generator/gen_enums.h"
#include "protos_generator/gen_extensions.h"
#include "protos_generator/gen_utils.h"
#include "protos_generator/names.h"
#include "protos_generator/output.h"
#include "upbc/common.h"
#include "upbc/file_layout.h"

namespace protos_generator {
namespace protobuf = ::google::protobuf;

// Adds using accessors to reuse base Access class members from a Proxy/CProxy.
void WriteRepeatedFieldUsingAccessors(const protobuf::FieldDescriptor* field,
                                      absl::string_view class_name,
                                      absl::string_view resolved_field_name,
                                      Output& output, bool read_only) {
  if (field->cpp_type() == protobuf::FieldDescriptor::CPPTYPE_MESSAGE) {
    output(
        R"cc(
          using $0Access::$1;
          using $0Access::$1_size;
          using $0Access::mutable_$1;
        )cc",
        class_name, resolved_field_name);
    if (!read_only) {
      output(
          R"cc(
            using $0Access::add_$1;
            using $0Access::clear_$1;
          )cc",
          class_name, resolved_field_name);
    }
  } else {
    output(
        R"cc(
          using $0Access::$1;
          using $0Access::$1_size;
        )cc",
        class_name, resolved_field_name);
    if (!read_only) {
      output(
          R"cc(
            using $0Access::add_$1;
            using $0Access::clear_$1;
            using $0Access::resize_$1;
            using $0Access::set_$1;
          )cc",
          class_name, resolved_field_name);
    }
  }
}

void WriteRepeatedFieldsInMessageHeader(const protobuf::Descriptor* desc,
                                        const protobuf::FieldDescriptor* field,
                                        absl::string_view resolved_field_name,
                                        absl::string_view resolved_upbc_name,
                                        Output& output) {
  output(
      R"cc(
        inline size_t $1_size() const {
          size_t len;
          $0_$2(msg_, &len);
          return len;
        }

        inline void clear_$1() { $0_clear_$2(msg_); }
      )cc",
      MessageName(desc), resolved_field_name, resolved_upbc_name);

  if (field->cpp_type() == protobuf::FieldDescriptor::CPPTYPE_MESSAGE) {
    output(
        R"cc(
          $1 $2(size_t index) const;
          absl::StatusOr<$0> add_$2();
          $0 mutable_$2(size_t index) const;
        )cc",
        MessagePtrConstType(field, /* const */ false),
        MessagePtrConstType(field, /* const */ true), resolved_field_name,
        resolved_upbc_name);
  } else {
    output(
        R"cc(
          $0 $1(size_t index) const;
          bool add_$1($0 val);
          void set_$1(size_t index, $0 val);
          bool resize_$1(size_t len);
        )cc",
        CppConstType(field), resolved_field_name);
  }
}

void WriteRepeatedMessageAccessor(const protobuf::Descriptor* message,
                                  const protobuf::FieldDescriptor* field,
                                  const absl::string_view resolved_field_name,
                                  const absl::string_view class_name,
                                  Output& output) {
  const char arena_expression[] = "arena_";
  absl::string_view upbc_name = field->name();
  output(
      R"cc(
        $1 $0::$2(size_t index) const {
          size_t len;
          auto* ptr = $3_$5(msg_, &len);
          assert(index < len);
          return ::protos::internal::CreateMessage<$4>((upb_Message*)*(ptr + index));
        }
      )cc",
      class_name, MessagePtrConstType(field, /* is_const */ true),
      resolved_field_name, MessageName(message),
      MessageBaseType(field, /* maybe_const */ false), upbc_name);
  output(
      R"cc(
        absl::StatusOr<$1> $0::add_$2() {
          auto new_msg = $3_add_$6(msg_, $5);
          if (!new_msg) {
            return ::protos::MessageAllocationError();
          }
          return ::protos::internal::CreateMessageProxy<$4>((upb_Message*)new_msg, $5);
        }
      )cc",
      class_name, MessagePtrConstType(field, /* const */ false),
      resolved_field_name, MessageName(message),
      MessageBaseType(field, /* maybe_const */ false), arena_expression,
      upbc_name);
  output(
      R"cc(
        $1 $0::mutable_$2(size_t index) const {
          size_t len;
          auto* ptr = $3_$6(msg_, &len);
          assert(index < len);
          return ::protos::internal::CreateMessageProxy<$4>(
              (upb_Message*)*(ptr + index), $5);
        }
      )cc",
      class_name, MessagePtrConstType(field, /* is_const */ false),
      resolved_field_name, MessageName(message),
      MessageBaseType(field, /* maybe_const */ false), arena_expression,
      upbc_name);
}

void WriteRepeatedStringAccessor(const protobuf::Descriptor* message,
                                 const protobuf::FieldDescriptor* field,
                                 const absl::string_view resolved_field_name,
                                 const absl::string_view class_name,
                                 Output& output) {
  absl::string_view upbc_name = field->name();
  output(
      R"cc(
        $1 $0::$2(size_t index) const {
          size_t len;
          auto* ptr = $3_mutable_$4(msg_, &len);
          assert(index < len);
          return ::protos::UpbStrToStringView(*(ptr + index));
        }
      )cc",
      class_name, CppConstType(field), resolved_field_name,
      MessageName(message), upbc_name);
  output(
      R"cc(
        bool $0::resize_$1(size_t len) {
          return $2_resize_$3(msg_, len, arena_);
        }
      )cc",
      class_name, resolved_field_name, MessageName(message), upbc_name);
  output(
      R"cc(
        bool $0::add_$2($1 val) {
          return $3_add_$4(msg_, ::protos::UpbStrFromStringView(val, arena_), arena_);
        }
      )cc",
      class_name, CppConstType(field), resolved_field_name,
      MessageName(message), upbc_name);
  output(
      R"cc(
        void $0::set_$2(size_t index, $1 val) {
          size_t len;
          auto* ptr = $3_mutable_$4(msg_, &len);
          assert(index < len);
          *(ptr + index) = ::protos::UpbStrFromStringView(val, arena_);
        }
      )cc",
      class_name, CppConstType(field), resolved_field_name,
      MessageName(message), upbc_name);
}

void WriteRepeatedScalarAccessor(const protobuf::Descriptor* message,
                                 const protobuf::FieldDescriptor* field,
                                 const absl::string_view resolved_field_name,
                                 const absl::string_view class_name,
                                 Output& output) {
  absl::string_view upbc_name = field->name();
  output(
      R"cc(
        $1 $0::$2(size_t index) const {
          size_t len;
          auto* ptr = $3_mutable_$4(msg_, &len);
          assert(index < len);
          return *(ptr + index);
        }
      )cc",
      class_name, CppConstType(field), resolved_field_name,
      MessageName(message), upbc_name);
  output(
      R"cc(
        bool $0::resize_$1(size_t len) {
          return $2_resize_$3(msg_, len, arena_);
        }
      )cc",
      class_name, resolved_field_name, MessageName(message), upbc_name);
  output(
      R"cc(
        bool $0::add_$2($1 val) { return $3_add_$4(msg_, val, arena_); }
      )cc",
      class_name, CppConstType(field), resolved_field_name,
      MessageName(message), upbc_name);
  output(
      R"cc(
        void $0::set_$2(size_t index, $1 val) {
          size_t len;
          auto* ptr = $3_mutable_$4(msg_, &len);
          assert(index < len);
          *(ptr + index) = val;
        }
      )cc",
      class_name, CppConstType(field), resolved_field_name,
      MessageName(message), upbc_name);
}

}  // namespace protos_generator